body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}

nav {
  background-color: #f2f2f2;
  padding: 10px;
}

nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

nav ul li {
  display: block;
  margin-bottom: 10px;
}

nav ul li a {
  text-decoration: none;
  color: #333;
}

main {
  display: flex;
  justify-content: space-between;
  padding: 20px;
}

section {
  flex: 2;
}

aside {
  flex: 1;
}

footer {
  background-color: #333;
  color: #fff;
  padding: 20px;
  text-align: center;
}
